Bug 888841 - To use the specific value from device makefile for GAIA_DEV_PIXELS_PER_PX. r=timdream.
Merge pull request #10783 from marcofreda527/bug-888841-gaia-px

Bug 888841 - To use the specific value from device makefile for GAIA_DEV_PIXELS_PER_PX. r=timdream